html {
  width: 100%;
  height: 100%;  
  overflow: hidden;
  padding: 0;
  margin: 0;
  outline: 0;
}

body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #e0dad2;
  border: 30px solid #a2998c;
  margin: 0;
  padding: 0;
  outline: 0;
  font-family: 'Lucida Grande', Arial;
  font-weight: bold;
  font-size: 50px;
  font-size: 7vw;
  color: #a2998c;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  -moz-user-select: none;
  -webkit-user-select: none;
  user-select: none;
  cursor: default;
}

/* Main Components */
#container {
  width: 100%;
  height: 100%;
  text-align: center;
}
.button{
  background: #a2998c;
  border: none;
  outline: 0;
  padding: 20px 50px;
  margin: 0;
  font-family: 'Lucida Grande', Arial;
  font-weight: bold;
  font-size: 40px;
  font-size: 5vw;
  color: #e0dad2;
  border-radius: 5px;
  width: 92%;
  margin: 20px 0;
}
.button:hover {
  background: #91887b;
  cursor: pointer;
}
.button[disabled] {
  pointer-events: none;
  opacity: 0.5;
}
#logo {
  background-image: url('');
  width: 100px;
  height: 100px;
  position: absolute;
  bottom: 60px;
  left: 50%;
  margin: 0 -50px 0 -50px;
}

/* index.html */
#container {
  display: -webkit-box;
  display: -ms-flexbox;
  display: -webkit-flex;
  display: flex;
  -webkit-flex-direction: column;
  -webkit-box-direction: column;
  -ms-flex-direction: column;
  flex-direction: column;
  -webkit-justify-content: center;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  justify-content: center;
  -webkit-box-align: center;
  -webkit-align-items: center;
  -ms-flex-align: center;
  align-items: center;
}

@media screen and (max-height: 400px) {
  .button {
    padding: 5px;
  }
}